What is the percent activity of a radioactive sample (relative to its original activity)that has undergone four half-lives of decay?

Name: What is the percent activity of a radioactive sample (relative to its original activity)that has undergone four half-lives of decay?
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Question

Quizplus · Accepted Answer

After each half-life, the activity of a radioactive sample is reduced by half. After four half-lives, the activity is reduced to (1/2)^4 = 1/16, which is 6.25% of its original activity.

What Is the Percent Activity of a Radioactive Sample (Relative